Spring学习笔记：Spring整合Mybatis（mybatis-spring.jar）（一：知识点回顾）

一、知识点回顾

　　1、Mybatis环境搭建（DAO层的实现）（使用maven项目管理工具）

　　需要引入的依赖包：

<!-- 单元测试junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.3</version>
            <scope>test</scope>
        </dependency>
        <!-- log4j -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <!-- mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.2.2</version>
        </dependency>
        <!-- mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.43</version>
        </dependency>

　　　　核心配置文件：configuration.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<!--核心配置文件的根节点-->
<configuration>
    <properties resource="database.properties"></properties>
    <typeAliases>
        <package name="cn.tengyu.entity"/>
    </typeAliases>
    <!--数据库的连接信息-->
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <!--数据库连接属性-->
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <package name="cn.tengyu.dao"/>
    </mappers>
</configuration>

　　　　Mapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.tengyu.dao.DeptMapper">
    <!--查询记录数-->
    <select id="count" resultType="int">
        SELECT count(1) as count FROM dept
    </select>
    <select id="findAll" resultType="Dept">
        SELECT * FROM dept
    </select>
    <select id="findByName" resultType="Dept" parameterType="String">
        SELECT * FROM dept WHERE deptname=#{deptname}
    </select>

    <!--查询某部门员工信息-->
    <resultMap id="empList" type="Emp">
        <id property="empno" column="empno"/>
    </resultMap>
    <select id="findByDeptName" parameterType="String" resultMap="empList">
        SELECT emp.* FROM emp,dept WHERE dept.deptno=emp.deptno
        AND deptname like concat ('%',#{detname},'%')
    </select>
    <!--添加修改部门信息-->
    <insert id="addDeptByName" parameterType="string">
        INSERT INTO dept(deptname)VALUES (#{deptname})
    </insert>
    <insert id="addDept" parameterType="Dept">
        INSERT INTO dept(deptno,deptname)VALUES (#{deptno},#{deptname})
    </insert>
    <!--删除部门信息-->
    <delete id="delDept" parameterType="int">
        DELETE FROM dept WHERE deptno=#{deptno}
    </delete>
    <!--修改数据-->
    <update id="modifyDept" parameterType="string">
        UPDATE dept SET deptname=#{newdeptname} WHERE deptname=#{deptname}
    </update>
</mapper>

　　　　MybatisUtil.java

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

public class MybatisUtil {
    static SqlSessionFactory factory;
    static SqlSession sqlSession;

    /**
     * 初始化SqlSessionFactory对象
     */
    static {
        try {
            InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
            factory = new SqlSessionFactoryBuilder().build(is);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 创建SqlSession对象
     *
     * @return
     */
    public static SqlSession createSqlSession() {
        sqlSession = factory.openSession(false);
        return sqlSession;
    }

    public static void closeSqlSession(SqlSession sqlSession) {
        if (sqlSession != null) {
            sqlSession.close();
        }
    }
}

　　　　测试（使用mybatis实现增删改查）

private static Logger logger = Logger.getLogger(DeptMapperTest.class);
    @Test
    public void getCount(){
        SqlSession sqlSession = MybatisUtil.createSqlSession();
        int count = sqlSession.selectOne("cn.tengyu.dao.DeptMapper.count");
        logger.debug("部门表总记录数："+count);
        sqlSession.close();
    }
    @Test
    public void findAll(){
        SqlSession sqlSession = MybatisUtil.createSqlSession();
        List<Dept> depts = sqlSession.selectList("cn.tengyu.dao.DeptMapper.findAll");
        for (Dept dept :depts) {
            logger.debug("编号："+dept.getDeptno()+"\t名称："+dept.getDeptname());
        }
        sqlSession.close();
    }
    @Test
    public void findByName(){
        SqlSession sqlSession = MybatisUtil.createSqlSession();
        try {
            Dept dept = sqlSession.getMapper(DeptMapper.class).findByName("公关部");
            logger.debug("编号："+dept.getDeptno()+"\t名称："+dept.getDeptname());
            sqlSession.close();
        } catch (Exception e) {
            logger.debug("查询结果为空！！！");
            e.printStackTrace();
        }
    }

    @Test
    public void findByDeptName(){
        SqlSession sqlSession = MybatisUtil.createSqlSession();
        List<Emp> emps = sqlSession.getMapper(DeptMapper.class).findByDeptName("广告");
        for (Emp emp :emps) {
            logger.debug("编号："+emp.getEmpno()+"\t姓名："+emp.getEmpname());
        }
        sqlSession.close();
    }
    @Test
    public void addDeptByName(){
        SqlSession sqlSession = MybatisUtil.createSqlSession();
        int i = sqlSession.getMapper(DeptMapper.class).addDeptByName("XXX");
        if (i>0){
            sqlSession.commit();
            logger.debug("添加数据成功"+i+"条");
        }
        sqlSession.close();
        this.findAll();
    }
    @Test
    public void addDept(){
        SqlSession sqlSession = MybatisUtil.createSqlSession();
        Dept dept = new Dept();
        dept.setDeptno(1);
        dept.setDeptname("娱乐部");
        try {
            int i = sqlSession.getMapper(DeptMapper.class).addDept(dept);
            if (i>0){
                sqlSession.commit();
                logger.debug("添加数据成功"+i+"条");
            }
        } catch (Exception e) {
            sqlSession.rollback();
            logger.debug("数据添加失败！");
            e.printStackTrace();
        } finally {
            MybatisUtil.closeSqlSession(sqlSession);
        }
        this.findAll();
    }
    @Test
    public void delDept(){
        SqlSession sqlSession = MybatisUtil.createSqlSession();
        try {
            int i = sqlSession.getMapper(DeptMapper.class).delDept(12);
            if (i>0){
                sqlSession.commit();
                logger.debug("删除数据成功"+i+"条");
            }
        } catch (Exception e) {
            sqlSession.rollback();
            logger.debug("数据删除失败！");
            e.printStackTrace();
        } finally {
            MybatisUtil.closeSqlSession(sqlSession);
        }
        this.findAll();
    }
    @Test
    public void modifyDept(){
        SqlSession sqlSession = MybatisUtil.createSqlSession();
        try {
            int i = sqlSession.getMapper(DeptMapper.class).modifyDept("测试部", "销售部");
            if (i>0){
                sqlSession.commit();
                logger.debug("修改数据成功"+i+"条");
            }
        } catch (Exception e) {
            sqlSession.rollback();
            logger.debug("修改数据失败！！！");
            e.printStackTrace();
        } finally {
            MybatisUtil.closeSqlSession(sqlSession);
        }
    }

　　2.Spring框架搭建

　　　　依赖的jar包：（maven添加以下依赖即可）

<dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.3</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.43</version>
        </dependency>

　　　　多种数据源的引用：

<!--添加数据源-->
        <!--spring JDBCTemplate-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>
        <!--druid-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.18</version>
        </dependency>
        <!--dbcp 数据源-->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>
        <!--c3p0-->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>

　　　　DAO层实现：（为了使用getJdbcTempalte()方法需要注入/实现JdbcDaoSupport接口）

import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.support.JdbcDaoSupport;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

public class NewsDaoImpl extends JdbcDaoSupport implements INewsDao {
    @Override
    public List<News> findAll() {
        String sql = "SELECT * FROM infosm_news";
        List<News> list = getJdbcTemplate().query(sql, new RowMapper<News>() {
            @Override
            public News mapRow(ResultSet rs, int rowNum) throws SQLException {
                News news = new News();
                news.setNewsid(rs.getInt("newsid"));
                news.setNewstitle(rs.getString("newstitle"));
                news.setNewscontent(rs.getString("newscontent"));
                news.setClickcount(rs.getInt("clickcount"));
                return news;
            }
        });
        return list;
    }
}

　　　　核心配置文件：applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--通过bean元素生命需要Spring创建的实例。该实例的类型通过class属性指定，
    并通过id属性为该实例制定一个名称，以便于访问-->
    <!--DataSource jdbc-->
    <bean id="dateSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql:///infosm"/>
        <property name="username" value="root"/>
        <property name="password" value="tengyu"/>
    </bean>
    <!--DataSource druid-->
    <!--<bean id="dateSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql:///infosm"/>
        <property name="username" value="root"/>
        <property name="password" value="tengyu"/>
    </bean>-->
    <!--DataSource c3p0-->
    <!--<bean id="dateSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"/>
        <property name="jdbcUrl" value="jdbc:mysql:///infosm"/>
        <property name="user" value="root"/>
        <property name="password" value="tengyu"/>
    </bean>-->
    <!--DataSource dbcp-->
    <!--<bean id="dateSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql:///infosm"/>
        <property name="username" value="root"/>
        <property name="password" value="tengyu"/>
    </bean>-->
    <!--jdbcTemplate-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dateSource"/>
    </bean>
    <!--newsDao-->
    <bean id="newsDao" class="cn.infosm.dao.impl.NewsDaoImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate"/>
    </bean>
    <!--newsService-->
    <bean id="newsService" class="cn.infosm.service.impl.NewsServiceImpl">
        <property name="dao" ref="newsDao"/>
    </bean>
    <!--talkDao-->
    <bean id="talkDao" class="cn.infosm.dao.impl.TalkDaoImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate"/>
    </bean>
    <!--talkService-->
    <bean id="talkService" class="cn.infosm.service.impl.TalkServiceImpl">
        <property name="dao" ref="talkDao"/>
    </bean>
</beans>

　　　　正常测试即可：

@Test
    public void findAllNews(){
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        INewsService newsService = (INewsService) context.getBean("newsService");
        List<News> list = newsService.findAll();
        for (News news :list) {
            System.out.println(news.getNewstitle());
        }

    }

    @Test
    public void findAllTalks(){
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        ITalkService talkService = (ITalkService) context.getBean("talkService");
        List<Talk> list = talkService.findAll();
        for (Talk talk :list) {
            System.out.println(talk.getTid()+talk.getContent()+talk.getTalktime());
        }

    }